It sounds like you really had no business going on a beach dive, guided or not. You are not "fully trained," you are barely trained, and your additude is a problem.

Was the guide aware of your experience level? Did he ask you any questions about how many and what kind of dives you have in your log book?

I once made the mistake of agreeing to guide some divers someone else had spoken with over the phone, without first checking them out. As the time grew near I spoke with them and figured out that (a). they had no gear and needed to rent. (b). were six dives out of OW. (c). their only shore dive experience was at Casino Point. (d). they were going to be very high maintinence jerks not worth the $100 they were waving at us.

I canceled the dive plans and pissed them off.

Beach diving is an advanced skill you are not going to get in a lake. You should arranged to take an advanced class and /or arrange for beach training. A guide is not an instructor and is not even really there to hold your hand. Based on your additude I'll reserve my judgement on the guide.

You should always be willing to walk away from a dive if you suspect the conditions may be beyond your abilities. It is important that you know what your limitations are and not have some fantasy going on in your head about what you are doing down there.